Polish rod shock absorber



c. B; MoALLlsTER 2,925,266

Feb. 16, 1960 POLISH ROD SHOCK ABsoRBER 3 Sheets-Sheet 1 Filed June 18, 1958 ATTORNEYS.

Feb. 16,1960 c. B. MoALLlsTER 2,925,266

' POLISH Ron SHOCK ABsoRBER Filed June 18, 1958 3 Sheets-Sheet 2 ATTORNEYS.

Feb. 16, 1960- c. B. McALLlsTER 2,925,256

' POLISH ROD SHOCK ABSORBER Filed June 18, 1958 5 Sheets-Sheet 25 7 "i, E 9 i] /l l ,6 :i /5 9 INVENTOA fa Cornelius B. MCA/[lister:

, corners of said plate to reinforce same.

the sleeve 46 vintermediate itsends and said ilange secured to the bottom of the base `plate 8 by suitable fasteningrdevices suchas screws 51. A lubrication tting 52 is preferably arranged in the lower portion-'of the sleeve in communication with a bore 53 in the bushmg whereby lubrication may be -applied to the bushing and polish rod. The structure of the guide is such that when the fastening devices 51 are removed, the lower plate 8 can be moved from the polish rod with the Vguide member moving through the slot 39. The slot or lateral passage 40 in the head plate 9 substantially corresponds in shape to the slot 39 and said head plate 9 has an upstanding flange 54 around the inner portions of said slot with ribs 55 extending outwardly therefrom toward the The inner portion of the slot 40 and inner surface defined by the upstanding rib 54 defines a polish rod opening 56 which tapers downwardly to recevea U-shaped insert or guide bushing S7 having a through bore 58 adapted to receive the polish rod 2, said insert 57 having a lateral passage 59 from the bore 58 to one side forming an open face insert with the passage opening toward the slot 40. The taper is such that the insert 57 will t therein and the bore 58 will engage the polish rod extending there through while the bushing is extending out of the open.

ing 56 formed by the ribs 54, and on downward movement of the bushing relative to the plate 8, the cooperating tapers on the insert and in the opening S6 will cause the legs of the bushing to be compressed to clamp a polish rod 2 therein. A bolt 60 extends through apertures 61 in the ribs 55 and has a nut 62 thereon to further compress the bushing by drawing the ribs together7 said bolt serving to hold the bushing in the slot. It is preferable that the open face of the bushing be inclined downwardly and outwardly as at 63 to engage the bolt 60 whereby the taper of the bushing and the inclined face cooperate with the bolt and socket to retain the bushing against movement relative to the plate 9. A polish rod clamp 64 is adjusted on the polish rod above the guide bushing or insert 57 and secured thereto whereby the weight of the polish rod will be applied through the guide bushing 57 to the head plate 9.

rods to great stresses, nvibration and impact shocks, but in the present structure, the rod is held substantially centered by the clamping action of the upper guide bushing 57, and the close fit of the rod in the bore of the bushing 48 in kthe lower guide 47 reduces the vibration. Lubricant is applied through the tting 52 whereby the rod can reciprocate in the lower guide in response to compression and expansion ofthe cushion units 15.

It is believed obvious that I have provided an improved polish rod shock absorber to reduce vibration and wear on the polish rod and provide easilyreplaceable parts for economic' operation. l

It is to be understood that while I have illustrated and described one form of my invention, it is not to be limited to the specific form or arrangement of parts herein described and shown except insofar as such limitations are included in the claims.

YWhat I claim and desire to secure by Letters Patent 1. Al shock absorber for connecting a beam hanger and a polish rod of a well pump comprising, a base plate supported on the hanger, a head plate spaced above the base plate, a plurality of cushion vunits interposed between the base and head plates and urging said plates apart, said plates each having a polish rod opening sub'- stantially centrally thereof with lateral passages extending from said polish rod openings to a side of the respective plates, an elongate guide fixed to the base plate and sleeved on and slidable on the polish rod disposed In applying the shock absorber to a polish rod,f the I plates 8 and 9,'cushion members 15 and stop Vmembers 31 are assembled, as illustrated anddescribed. It is then movedto the well location, and the nuts 27 removed from the hanger rods. The fastening devices 511. are removed and bolts 60V removed whereby the guide bushing V57 may be lifted from the opening 56 in the plate 9. The polish rod clamp 64 is removed from the polish rod 2, and then the upper end of the polish rod 2 is insertedinto the bore 49 of the guide bushing 48, and said n guide moved downwardly on the polish rod. The shock absorberrl is then swung whereby the polish rod .enters the slots 39 and 40 and then the flange Si) is moved into engagement with the bottom of the plate 8 andthe fastening devices 51 applied to secure the guide to said plate. The tapered guide or insert 57 is then moved onto the polish rod and inserted into the opening 56 and forced therein whereby the tapers on the Vguide andxopening 'cause the insert 57 to grip the polish rod.-The bolt A and nut 61 are then applied to hold'the gu'ide'bushn ing or insert 57 in place. The polish rod clamp 64 is then placed on the polish rod and the fastening devices 6 5 tightenedto secure theclarnptto Asaid rod, in adjusted in the polish rod opening inthe base plate, the polish rod opening in the head plate having downwardly and inwardly tapered sides, a second guide having tapered sides seating in said tapered polish rod opening in the head plate, said secondguide having a through bore with a lateral passage forming an open side toward the lateral passage in the head plate whereby the polish rod extends through said-bore and the tapers -of the second guide and polish rod opening in the head plate clamp said second guide' on -said polish rod,'and a polish rod clamp on the polishrod resting onfsaid second guide for supporting the polish rod. Y 'Y 2. A shock absorber'ffr connectinga beam hanger and a polish rodvof Va'vvell pumpcomprising, a `base plate supported cn the hanger, a head plate spacedabove the base'plate, va 'plurality of cushion funits interposed between the base and head plates and urging said plates apart, a plurality of stop members; on one of the 'plates and engageable with the `other to limit the spacing b'e-Y tween saidheadandtbase plates and'apply a pre-loading on the cushion units, said plates each having a polish rod opening substantially centrally thereof with lateral passages extending from said polish rod openings to a side of the respectivev plates, an elongate guide` sleeved on and slidable on the polish rod disposed Vin the polish rod opening in the base platejand extending downwardly therefrom, means removably securing said guide to the base plate, the .polishfrod openingv in the head plate having downwardly and inwardly tapered sides, a second position.V The apparatus is 4then Vin 'conditionfor` the f pumping of therwell.` The weight of jthe ypolish'rods and loading thereon applies a downward force .on the head plate 9,andthehangers apply an vupward force on the base plate' compressing the cushion .units` 15". The

reciprocaton of the hangersrd by `operation-rot' 'the walking bearn 5 allows the weight on the polish vrod to pull same downwardly on the down stroke, and on theup strokethe polish rod is'raised to also raise liquid inthe well. -'Ihe reversalA offorces normallv vSubject, polish guide having tapered sidesV seating in said taperedpolish rod opening in the head plate, said second guide having a throughbore withl a `lateraljpassageV forming an open side towardthelateral passageY in the head plate .wherebythe polishrod extends through said bore and the tapers ofthe second guide and polish rod opening in the head Vplate clamp said second guide. on said polish rod, means Ain the head plate `retaining the` second guide against,verticalnmovernent vrelative to said head plate,

Vand a polish rodrclarnp on the prlish rod resting on said Asecond guideforsupportng ,the polish rod.

3. A shock'absorber Vfor connecting a beam hanger and a polish rodY of a 'vell'pump comprising,va base plate, a head plate spaced vertically above the base plate, said plates having aligned openings formed therethrough `at their end portions for hanger rods to extend therethrough v and connect tothetbase plate, guide means on one of the plates and slidably engaging the otherifor maintaining f alignment of said plates' during'relative'movement thereof, a plurality 'of cushion units interposed between the t e, head andbase-plates and'urgingsanne;aparentaV POlishL Q t rod opening in eaehof1theplates'intermediate the hanger rod openings, an elongateV guide bushing having a por-gv w Y said Yplates having'alglled opening'sformedtherethrough .l at theirend portions forfhange'r'rodsto extendjtheret, 'throughfandconnect to the,v base plate', guide means on one ofthe plates and .slidablyengaging the other for t maintainingV alignment of .said plates during relative tion disposedxin the intermediate opening Vin the khase plate and having-a through bore slidably receiving"said` polish rod, means on' saidfelongateibushing. removably f securing sameto thebase'plate said intermediate 'openingin thel head plate having downwardly and inwardly!Y t' tapered sides, an upper removable Yguide having tapered sides disposed in the intermediate opening of the head plate, said Vupper guide having a through bore for receiving said polish rod an a lateral slot extending from said bore whereby said tapers in the intermediate opening in the head platev and upperguide cooperatein response to downward movement of said upper guide in said intermediate opening of the head plate to elect clamping engagement ofrsaid upperguide with saidv polish rod, and a rod clamp secured to thepolish rod and engaging said upper guide to support the polishrod thereon t 4. A shock absorber for connecting a beam hanger and a polish rod of a well pump comprising, a base plate,

a head plate spaced vertically above the base plate, said t plates having aligned openings formed therethrough at lateral.y passage in the ,head plate'adiacent said upper ,V

, guide tol restrain said upper guide against vertical movey Y ,mentrelative to said headplate.

j 5.j'A shock absorber fora-connectiriga beam hanger'fA` f and alpolish rodof agwelll pump comprising, a base plate, a head plate spaced vertically above the base: plate,

movement thereof, a plurality of cushion units interposed between the head and base plates and urging same apart, stop means engagingsaid plates to limit spacing thereof and apply a pre-loading on the cushion units, a polish rod opening in each yofthe plates intermediate the hanger rod openings with lateral passages t extending from said polishrod openings to the side of a respective plate, an elongate guide bushing having a portion disposed in the intermediate opening in the base plateV and havingia through bore slidably receiving said polish rod, means on Vsaid elongate bushing removably securing same to the base plate, said intermediate opening in the head plate having downwardly and inwardly tapered sides, an upper removable guide having tapered sidesA disposed in the intermediate opening of the head plate, said upper guide having a through bore for retheir end portions for hanger rods to extend therethrough and connect to the base plate, guide means on one of the plates and slidably engaging the other for maintaining alignment of said plates during relative movement there f of, a plurality of cushion units interposed between the head and base plates and urging same apart, Va polish rod opening in each of the plates intermediate the hanger' rod openings with lateral passages extending from said polish rod openings to a side of the vrespective plate,

an elongate guide bushing ffvired; to said baseplate and. having a portionl disposedlinthe intermediate-opening l r-in the base plateand having a through boreslidably receiving said polish rod, anl upper removable guide disposed in the intermediate opening ofV the head plate, Vsaid upper guide having a through bore for receiving Vsaid Y polish rod with a lateralV passage extendinglfrom said bore to the side toward,l the lateralrpassa'ge in vrsaid head plate, means on theljhead plate compressingk said upperguide to eiect clampingf engagement of saidrrupper guide with said polish'r'odavrod clamp secured to the polish rod and engaging said upper guide to support the polish rod thereon, andmeansextending transverselyo response to downward movement of said`upperV guide in said intermediate opening of the head plate to effectV clamping engagementV of said upper guide `with said polish rod, and a rod clamp secured to the polish rod and engaging said upper guide to support the polish rodr` Y. thereon, and means extendingltransversely of the lateral passage in the head plate zadjacent said upperguide to Y g. restrain said upper guide against vertical movement 'rela` tive to said head plate.

References Cited in the iile of this patent UNITED STATES PATENTS Great Britain Dec. 11,*17924 

